• Thumbnail for Micrite
    Micrite is a limestone constituent formed of calcareous particles ranging in diameter up to four μm formed by the recrystallization of lime mud. The term...
    4 KB (447 words) - 22:59, 15 October 2023
  • Thumbnail for Limestone
    crystals less than 5 μm (0.20 mils) in length is described as micrite. In fresh carbonate mud, micrite is mostly small aragonite needles, which may precipitate...
    72 KB (8,485 words) - 15:26, 13 August 2024
  • Thumbnail for Peloid (geology)
    Peloids are allochems that are composed of micrite, irrespective of size, shape, or origin. The two primary types of peloids are pellets and intraclasts...
    1 KB (130 words) - 10:43, 16 August 2023
  • Thumbnail for Permian Basin (North America)
    rigid skeletons, and abundant red algae, microbial micrite, and inorganic cement. The microbial micrite worked to trap sediment. One of the most prominent...
    59 KB (7,010 words) - 20:16, 16 July 2024
  • Thumbnail for Portland Admiralty Roach
    years ago)) of the Late Jurassic epoch. It is formed from ooliths in a micrite (fine grained calcium carbonate) matrix. There are many voids in the stone...
    2 KB (174 words) - 15:22, 21 May 2024
  • limestones are also considered matrix-supported due to the predominance of micrite (as opposed to, for example, macrofossils). Leigh, Sebastian; Hartley,...
    1 KB (155 words) - 00:45, 24 July 2023
  • Thumbnail for Portland stone
    calcium carbonate (called calcite) accumulated forming lime mud (called micrite) which covered the sea floor. Small particles of sand or organic detritus...
    25 KB (3,007 words) - 10:58, 12 October 2024
  • Thumbnail for Phosphorite
    This means that their textures are similar to that of collophane, or fine micrite-like texture. Phosphatic grains may be accompanied by organic matter, clay...
    21 KB (2,488 words) - 20:13, 22 October 2024
  • Thumbnail for Wackestone
    size (> 2 mm) Contains carbonate mud (micrite, silt/clay size <63 μm) Fabric supported by carbonate mud (micrite, <63 μm) 10% or more composed of 63 μm...
    3 KB (322 words) - 23:08, 8 June 2023
  • Thumbnail for Allochem
    deemed an allochem. The allochems are typically embedded in a matrix of micrite (lime mud) or sparry calcite. Folk, R. L. (1959) Practical petrographic...
    1 KB (143 words) - 21:01, 5 September 2024
  • Automicrite is autochthonous micrite, that is, a carbonate mud precipitated in situ (no transporting) and made up of fine-grained calcite or aragonite...
    6 KB (820 words) - 20:48, 23 September 2024
  • Thumbnail for Downland
    microscopic coccoliths and other fine-grained fossil debris in a matrix of micrite mud. Small amounts of silica were also deposited, mainly from sponge spicules...
    11 KB (1,330 words) - 20:37, 5 August 2024
  • The suffix -sparite is used if the rock has a crystalline matrix, and -micrite if it contains a micritic, or mud-based, matrix. The prefix describing...
    11 KB (1,411 words) - 13:40, 30 June 2023
  • Thumbnail for Borra Caves
    a thin section has uncovered the presence of lithified structures and micrite, present as laminated to clotted with chocolate-brown blebs. These are...
    19 KB (1,904 words) - 04:46, 17 June 2024
  • Thumbnail for Chalk Group
    limestone composed of fossil debris ("bio") and calcium carbonate mud ("micrite"). Most of the fossil debris in chalk consists of the microscopic plates...
    22 KB (2,434 words) - 18:19, 31 January 2024
  • appearance to the Atima limestone (generally consisting of thick-bedded grey micrite), but it does not achieve the thicknesses common to the Atima, probably...
    2 KB (157 words) - 05:52, 16 June 2024
  • Thumbnail for Pellets (petrology)
    They are typically 0.03 to 0.3 mm long and composed of carbonate mud (micrite). Their most common size is 0.04 to 0.08 mm. Pellets typically lack any...
    3 KB (424 words) - 13:23, 31 December 2022
  • Thumbnail for Dolomite (rock)
    texture contrasts with limestone, which is usually a mixture of grains, micrite (very fine-grained carbonate mud) and sparry cement. The optical properties...
    27 KB (3,407 words) - 01:34, 19 September 2024
  • Thumbnail for Rudstone
    Rudstone with micrite. Width of picture is 36mm...
    2 KB (191 words) - 05:22, 13 June 2023
  • Thumbnail for Portland Group (geology)
    metres (250 ft) Lithology Primary Limestone, sandstone Other Mudstone, micrite Location Region England Country  UK Extent Dorset Type section Named for...
    4 KB (318 words) - 08:29, 30 May 2024
  • is composed of two beds of calcareous shale, divided by a bed of micrite. The micrite bed displays rigid body displacement with roof thrusts and ramp thrusts...
    2 KB (213 words) - 01:09, 17 September 2023
  • Thumbnail for Self-assembly
    three-dimensional shapes of self-assembling micrites examines Platonic solids (regular polyhedral). The term 'micrite' was created by DARPA to refer to sub-millimeter...
    40 KB (4,429 words) - 13:40, 9 October 2024
  • Thumbnail for Lulworth Formation
    Member is typically 11 to 16 m thick and largely consists of marls and micrites with interbeds of calcareous mudstone. The Ridgeway Member is about 3 to...
    11 KB (455 words) - 12:02, 18 October 2024
  • The group largely comprises limestones, including biosparite and cherty micrite but also some subordinate mudstones, siltstones and dolomites. Basaltic...
    4 KB (274 words) - 04:11, 1 September 2024
  • Portlandian — generally composed of 35 m of well-bedded cryptocrystalline micrites — takes up the major part of the anticline. Its grey to yellowish, sometimes...
    9 KB (1,320 words) - 07:19, 10 September 2021
  • Thumbnail for Lithographic limestone
    plattenkalk (a very fine-grained limestone that splits into thin plates, usually micrite) that extends through the Swabian Alb and Franconian Alb in Southern Germany...
    12 KB (1,461 words) - 23:48, 16 July 2024
  • more homogenised and settle out as fully marine flint-bearing calcareous micrites. During the Maastrichtian, a regression commences. After the initial deposition...
    48 KB (6,285 words) - 14:05, 21 May 2024
  • Thumbnail for Tafraout Group
    formed between the large coral patch reefs are documented by micrite and partially leached micrite. The Tafraout Group covers most of the W High Atlas, surrounded...
    105 KB (6,158 words) - 20:23, 30 October 2024
  • Thumbnail for Radiolarite
    southern Karawanks of Austria. They are composed of interlayered cherts and micrites separated by irregular, non-planar bedding surfaces. The cherty horizons...
    19 KB (2,513 words) - 13:20, 3 May 2024
  • fossilized specimen has calcispar walls with the inner chambers filled with micrite. The walls are raised because the calcispar does not erode as easily. C...
    3 KB (338 words) - 22:15, 29 October 2024